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IMPROVED MACHINE POR IORMING TIIBES 0I SHEET-METAL.

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Beit known that I, WILLIAM HALL, ofthe city of Dubuque, county of Dubuque, and State of Iowa, have invented a new and useful Machine for Forming Sheet Metal into-Tubes; and I do hereby declare that thefollowing is a full, clear, and exact description of the construction and operation 'of the same, reference being had to the annexed drawing, making a part of this specificatiomin which- Figures I and II represent vtop views of the machine.

Figure I shows the machine open and at rest; and

Figure II shows the machine when closed for work.I

Figure III representsa sectional view, x :11, of the machine. l

Figure IV shows the mandrel or rod around which the metal is to be formed.

2. Description by letters.

secured to the table W at each end of the plates A a. p C C represent the gearing, which consists of four cogwheels,"t\vo at each end ofthe machine,arranged vertically, the lower wheels being turned by the upper ones. D is an iron rod connecting the upper cog-wheels of the gearing, which are secured firmly to it, and turning the lower cog-wheels on each end at the same time. The said rod D acts as journalsfor said upper gears. E is the crank by which the rod D is turned. F is the outer end of the rod or mandrel around which the tube or platesA a.; there may be one, two, or more of them. The bars or arms to which they are attached extend back beyond the board or bar c-c. On the outer ends of 'these bars are attached wheelsd d. (See description of fig. e e represent the spiral springs by which the clamps are removed from the plates A a. H Hreprcforward exactly equal. This straight-edge has a ange projecting from its upper front, at an eleva ted angle from the plane of its horizontal movement, the object of whichis to force down the outer edne of' the sheet to be rolled to a line with the upper horizontal surface of the plate A. A a, fig. 2, the plates are closed. The apparatus GG is thrown forward and clamps the plates A a. The straightedge has been forcedVV against the plate and thc machine is supposed to be in motion.

3. Mode of operating the Machine, in which are described Figures [II and IV more fitiiy.

lhe strip of metal to be formed into a tube or cylinder is laid on the plate A. The lever K is now borne down, by which the apparatus G G is brought forward, the upper plate athrown down and securely held on the plate A byl the clamps I1 b. In order to understand this process see hg. 3, in which the jaws b b are seen approaching the plates A a. At the other extremity of the arms or bars are seen the wheels d d, in a groove or depression in the table W. In front of these wheels there is an inclined plane m. As the clamps b b slide over and under the plates A 0i loosely, the wheels el al climb the plane m, and thus throw down the upper jaws of the clamps b h on the plate a'. The mandrelor rod F (as seen, fig. 4,) now lies in the tube formed by the grooves in the plates A a, the inner end fitting a square hole in the centre of the ljournal connected with the gearing, and the other held to' the other gearing by a pin running through the rod.` This rod has a slot or groove its whole length, i lto which the inner edge of the metal is forced bythe straight-edge. The crank E is then turned, and the gearing on both ends operating exactly alike, the mandrel F is turned and the sheet of metal'drawn between the plates A a and around the mandrel, which may be extended once, twice, or as many times around it as is desired. 'lh'e lever K is then raised, the wheels d d descend the inclined plaire m, theja'ws 0f the clamps h b are releasedl from theirhold on the plates A a, and the springs e e instantly draw the apparatus G G back to its place and raise the plate a. The mandrel F is now drawn out of the tube, and the operation repeated as desired.

Claim.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The grooved plaies A a, hinged together and operated as and for-the purpose set forth.

2. The slotted mandrel F, in combination with gear-Wheels O C, arranged and operating as described,v

l 3. In combination with the grooved plates A a, the sliding straight-edged bar H H, Witlrits elerntesl projecting ange, as operated and described.

4. The sliding frame G Gr, with its clamping device I1 b, and wheels d d, in combination with the inclined plane lm m, operating substantially as described and for the purpose set forth.

5. I claim the combination and arrangement oF the plates A a, mandrel F, gear-Wheels C, sliding frame Gr, with its parts b, inclined plane m, and sliding bar H, with projecting flange, substantially as and for the' purpose se't forth. I

WILLIAM HALL.

Witnesses:

TH. C. CONNOLLY, E. G. FAST. 

